Question 21
Your teacher demonstrates the following investigation. Two test tubes A and B each contain 10 ml of freshly prepared copper sulfate solution. A cleaned grey iron nail is immersed in B; a second nail is kept on white paper for comparison. After 20 minutes the immersed nail is removed and placed beside the other nail. Wear suitable gloves and safety goggles; do not touch or ingest chemicals.
What does the green colour of the solution tell you about the ions present?
What does the green colour of the solution tell you about the ions present?
